Dig 'n pour a sidewalk tips?

[johnk]

You did a very nice job and now you can enjoy the rewards. No more weeds and blocks shifting etc. Nicely done!!

 

[Deeredriver]

I've had some luck filling up expansion joints with a pavement sealant my buddy recommended to me. Used it about 8 months ago and its been working well so far. No complaints here.
Dow Corning Pavement Sealants for highways, bridges and runways - Dow Corning